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細節
WRIGHT, Wilbour (1867-1912). 'Experiments and Observations in Soaring Flight', Journal of the Western Society of Engineers, vol. VIII, 1903. Chicago: 1903.
8 (220 x 143mm.) 8 text illustrations. Modern cloth-backed boards.
FIRST EDITION OF THE SECOND REPORT ON THE BROTHER WRIGHT'S AERONAUTICAL EXPERIMENTS AND THE FIRST ACCOUNT OF THEIR ATTEMPTS WITH MOTORIZED GLIDERS. Wilbour and Orville Wright showed from their youth great skills and ingenuity in mechanics and spent their first professional years in designing and selling bicycles. The turning point of both their lives arrived after they had read about the death of the German pioneer in aeronautics, Otto von Lilienthal, which occured on 10 August 1896 as a result of an accident during experiments with a glider. "By 1899 they had carried their theory of lateral balance (aileron control) to the point of a practical demonstration made by Wilbour, in August, using a five-foot-span biplan kite. Equilibrium was maintained and maneuver made possible by varying the air pressure at the wing tips through adjustment of the angles of attack on the two sides. With this action and an adjustable horizontal surface (elevator), later (1902) combined with the compensating action of a movable vertical rudder, they achieved control about the three axes of the airplane. The system was patented in 1906 and has been used on all airplanes ever since" (DSB). Printed at the end of the account on soaring flight is the discussion concerning the Wright 'brothers' recent experiments with motorized gliders. Norman 2267 (the off-print); Dibner 185.
8 (220 x 143mm.) 8 text illustrations. Modern cloth-backed boards.
FIRST EDITION OF THE SECOND REPORT ON THE BROTHER WRIGHT'S AERONAUTICAL EXPERIMENTS AND THE FIRST ACCOUNT OF THEIR ATTEMPTS WITH MOTORIZED GLIDERS. Wilbour and Orville Wright showed from their youth great skills and ingenuity in mechanics and spent their first professional years in designing and selling bicycles. The turning point of both their lives arrived after they had read about the death of the German pioneer in aeronautics, Otto von Lilienthal, which occured on 10 August 1896 as a result of an accident during experiments with a glider. "By 1899 they had carried their theory of lateral balance (aileron control) to the point of a practical demonstration made by Wilbour, in August, using a five-foot-span biplan kite. Equilibrium was maintained and maneuver made possible by varying the air pressure at the wing tips through adjustment of the angles of attack on the two sides. With this action and an adjustable horizontal surface (elevator), later (1902) combined with the compensating action of a movable vertical rudder, they achieved control about the three axes of the airplane. The system was patented in 1906 and has been used on all airplanes ever since" (DSB). Printed at the end of the account on soaring flight is the discussion concerning the Wright 'brothers' recent experiments with motorized gliders. Norman 2267 (the off-print); Dibner 185.